SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b1f350685f0628f0c502079137442c57e6f338e1ff89833c15f74653d98d12' 
  AND token = 'TOOxePW+qvXeQzhbs+/dLZUKj6Z7mipa4VRP981h5sc=' 
  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"
    }
  }
}