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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11462c0c7cf4b99c5ea9602375b564a60435296ddf0062e8628fbce93f597d39' 
  AND token = 'wacgrjL7mGW6fTqG/6TLIr1FiYg5JS6b8txeAV7xiRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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