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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3631cc1eb14de97185fa717d16bd8191c0eebcd0374c72d10766bec94362c660' 
  AND token = 'Whyzs48xRy2JwYnS9EElp5qyDq2ymDq3NFkZKWAmAEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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