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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3740949d3b2f26a551b7160c624462e5f83da2f80d222d987838ccb822b32340' 
  AND token = 'kRI2zOJJuXD/DC6GVThJdaj/eQj8dm04UjybMOMbhgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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