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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '791892d2b07ed74561dc6bd792e4bd96b96d13d306a24118f4dc2c83fc1973f7' 
  AND token = 'qbA12wQUgj8K6wi6nP3ddZXdKlAEflA3H4xQ+sVubfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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