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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45aa0e3703458ef3b3104cb7688018ae83f2d6af291691aae833d0fff6e23ff9' 
  AND token = 'kGxFMJCq4gU1hEuyPCzaT9Q1hyVcQqpFIAF/lk9pZQ0=' 
  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"
    }
  }
}