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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ce963f85cf9f5036f012f8e0efd5ea1b4b2d10bcd2afbf419cc16a9b3c361d' 
  AND token = 'JK6k7Z+aunVeaYpXHGQT8s6SxDNKAUCel8JorJtD/sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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