SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93582f2091f4bf0ccfde8010fd9543f7ea3e2a6896130d7b01013b0167a50913' 
  AND token = '0+YOmgKBpQvpgxobm4XNVzL/ex9UuQU34h5jONxlJJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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