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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '476ec0ba7460f3d1e9c7c591ca91c974fcfd3673836be082b1e16d6281acdd5b' 
  AND token = 'nZmQjFHLwQ0bI3RMlCx8eV5jytQxvT/PT39t3/uvEhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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