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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd410751b7f1d0c71d08cb0b0aa541902b8b626614d4e86aecdca1010b6cd7541' 
  AND token = '3jv0hauPQjZmByUe8fmwsfbSGRAN0MxJmKKJYVnCXrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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