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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7b16b18425aa8841f9f059a2bca9a8e8c18a1449f11e0241002d6ed205a9eb2' 
  AND token = 'XtFKIFL4fUGjE92NRQlh8R5gk03tMuM6LSoWEGW5lH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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