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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b0e8f95a8ee517aeb55489de400325f83fd863c86f9294a973cf4d8f13d8460' 
  AND token = 'MrKE8B9/08tWAtjVLfZPHIQPhq+eK7S3Xh3ZjYbf4DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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