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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '456164d63d592d5d7de705d97f9b6a048a5df36885cffc4e91247644803aaa0e' 
  AND token = 'I323sqjjA7nhdTnkw5dzKJyFGEiz432GBRD9alF28dc=' 
  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"
    }
  }
}