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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2433f8f374f9b84a8b08a097a0c7d7c3e4a8a46572977519108feca9c4e8b075' 
  AND token = 'l8/9Qx7R1fuSc6mZ5J4AELdUiGf0O1rAXNrvgSpV2+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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