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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc50637c2b614ba18b70cb6cdb5d7d8964b9dee5c62823f6830dd359f058f445' 
  AND token = 'GyYU7T5YUe196nJw2L1KM3PYpQC8aTkSWHqOe0D3Biw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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