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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '042c00a079bd2385b77c71973b09bf74437d8e8cda68a3245cc3abd212ed2fd8' 
  AND token = '3w1H/JosU8yZ7qHw0v2eZfcQdn7u1H/egXjnnHu5cZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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