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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83eeb3e5dc1103078af128e02121d4a4d871b0945c9d203186687964fd80ffdb' 
  AND token = 'szgjS4qOJd+sgyTqWOrJ9dsGEnHvOa0Y9h2js3LrFqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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