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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c4f5a0154f6bdeb922923cd293aaae21d7e258e62b21996a85e8d4e43a3603c' 
  AND token = '0xGI+Rol49YRbEBVjelOcsqfsKbzWpMQu2N0FyvEbKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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