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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a581e7cd8a72b99dfdccef3005aafa648783a781d8bb7975a95cace092616c' 
  AND token = '7llBBDWNBr2O7qvxq+FPZeTa7xSb3rQGGN/wdfjH794=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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