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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8992c0a3aa3c73aeba7916acdc045353b5d0b1cd2aed5f156812ac1b8b54a9a' 
  AND token = 'znGabqGk7vPwxRN1fV8ppobr9KgE9jyW/dX/i7Ojykk=' 
  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"
    }
  }
}