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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d6617e886d61d9bbeca9f07fdb24c5f205aca1b0c621c4341f0dac99589de9' 
  AND token = 'DYIWn10S9K0J8pIRL7gz4fWNiDVdJjsVIzlSHNvqK9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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