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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e9807478e81e9afe7f31faa7b13df73df901cb08b930bd6e87658db0734338b' 
  AND token = 'j2cxW00s4kIu0Ac5Dl3FVztjjn0oEN8FsHQy9Im4CMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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