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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a923a045e90a4c0a4fe9de80e36569e9e2aed3548d41d14911be3fcd9e61a77d' 
  AND token = '1C/ShsOuMQv5EtQlnZO3gtVgWLABnWu9Bzc9h9Iguk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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