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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c54a27f1389ed1f015e5a00fd5372b856de56f9c63b90fef28ae8b03f2c1b60e' 
  AND token = 'UknzolT5XgQ48cNknMfU+qITEc7yCxUaYClCkioGhnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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