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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eafd9659c4f3e8ca20b30a8b1423a4c7d4dde95785686837da85c1ec4fbeada7' 
  AND token = 'qKnskK7p+qnx4Z54Hhp3yDK5aiQhJmWaTd2uKF2shDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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