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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcec0afe54a5012ddd51acc7abf6aee5f972047cdf1072bd9c3b7ac656b702a1' 
  AND token = 'GNd2O4YDra8HLNmN20etN/21YZuuOoGmaPKKOh1MpLc=' 
  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"
    }
  }
}