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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6d8c9d37dffd81d43c40a5f9199ca624d51fcd06fd21c2616a93f7e252e59d8' 
  AND token = 'MSB3I98TOxyG3bk5l+v5XlwYo4KOHN0DFgRmb+3zBN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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