SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c25c3f3ebf478ab1733bfb61df13e44a140e6766dd6b35bf8464f82c9487d1a2' 
  AND token = 'TI6PuhpPotlw0MhAcnQwCpgvzKgVWYzrxCCoRjPZv20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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