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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf35ea472465af0f369797ef8fc24c61f3a67f8d74ff12ead1084e0b47cf771f' 
  AND token = 'imZWlK3GD6edzdt0xihgXAEbc+gkQFf0v/0bZpuDjYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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