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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b991c471005125b78f7a4e7ccb48c5300a42e2a3e3f88088b785ed39549a7d7' 
  AND token = '7zIFbtYqFbE1cWRrXlEaNBl26VDbQvL0YUBrI8u57Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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