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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c489bef2e4151f4cb4c5a674772465930ceebb5d9b9e9f6f96a25c8e755c0e9c' 
  AND token = 'LkSNYhD0LHX6jFb6Mcfl1royXldcghAxt9BEes9vpSw=' 
  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"
    }
  }
}