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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e37350396b99496a9b841f1ef8c8bb8bbf00231f6c845a1bac95497fee8187a' 
  AND token = 'rh11Se4ZuBZViMVjirq8xIOnZVh4HZHdhjshrH8t/7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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