SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a782d555c451ecf4d26695873792b2c63150f344267fe2c882db73322b6637b' 
  AND token = '1+uy4OUXue+UvGg7kRHrJMxFWkr++sP8dEzGcVtKYGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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