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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd500114ea02ea804ca5ee76e23b8ae8c48f0d6968c6955636c3ad29a6f91e8aa' 
  AND token = 'azwTmx6vBMdfK9RMerOyPT9jwY18vZcG0CJ2jtI5llA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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