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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df082f64952d5e219071e233fb3e8c73780753b6658d06af15ec5683de3ac200' 
  AND token = 'y2JK55zSlv4NNZLjUuKTVhfaWnJy36lpX0HzyW0ZM2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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