SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33c1d6ce02a0839d05c1966bc8c24a71394837e08ee75ac32175faa69165dd21' 
  AND token = 'LZGwKmpOmw0q4kxp/N4MlUipLB9RIgdxi+XBsb5kCZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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