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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd49e097f44becc60a71983f0bb00f78fa65cf5ff0d17cd3c676387dcae40fe40' 
  AND token = '7bC1V6zIFKuWCI692qmPFXYIYQnZrNeryhR2JdVAeVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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