SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86af1c226b20178d85999e24f466244458b4fc5879389510d33ef480ffcfdb88' 
  AND token = 'sRwXhVlYRPUb5VKodw95KCL0Pyt2zDgJAIfUl3GtoJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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