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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8448dc1d1be5967ddfccbb701484b2637b8c9d622db27511e523c1e833ba3fb9' 
  AND token = 'Z0GatU1y46UGnWJLBlERBLE2RMx7G2EZHH09vhaO1/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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