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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796f642f5ea569bdc68830f6d11783fdfa55e2e6da2061d784ad484ee2a60741' 
  AND token = 'ejIhpv+Le6QGWz8CFnaMvcIT1/7I2ZgXhy992W8O81E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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