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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9b9ef838cbdcec7003eb7b2dcff140eb3c1d976780f192b15b5a763d84441f' 
  AND token = '9h3XSVk5NOc3R53l9C3xbyL1hSL+0cnqW2MPyoDlnYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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