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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf245ce335a6278eac10e2069598537d1aab2d47047b2cc2ee3e5c4f0b131cd2' 
  AND token = 'dQ8w/k7s2vcLYUjvF+XkpZDIoZbMvodAO2w6PeUqdBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}