Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5203e71598458b21becef38e116fd63899619ecf233426a3803b874ab4702e3e' 
  AND token = 'sWV4SQ3qOchnnfV35h0P3a8IMR3m97wV5om313pCqoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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