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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd92a5bb06c739ffb827392a9b4ebd7a87897584aae42e532c8a185fd249ce62' 
  AND token = 'ZdKxtTpdqZkqDxuo24ZvDjkoY4Xe51OBpv71hOj6EzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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