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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4658b20ffa633058cdee60f23d7859545fc7a35df6ae08906f7b684abb3ca9d7' 
  AND token = 'z7qxZxukM9TPSh3WLRwLOoDdY1h4ZLYDxo3RTm5dgXU=' 
  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"
    }
  }
}