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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a3ca80defbb257df10b3a3b871b78f72ab48b8ccd40a72a42b029ca9737f1a' 
  AND token = 'IOAxixmStaK6Grj63rKUWwPnTs5y9GQ0LKsh+QPk2K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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