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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95674f3cc1fb19f03ea0f1a7f0d78738766c5932113ba4181e9c59cfe4ab8800' 
  AND token = 'O1pwuJRe/6DwLA0jcpU4l8gDaXkQgeL2AGvZ1GuaRzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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