SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf0547fea48c2d8265f43c3c521b4a49ca4cde153f7ebd571babd369f160f5b' 
  AND token = 'RzntV8NvkalPVYVbjW7owchg/Uk+PDLxPRXoy/V6TfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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