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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c42a0d20ef3188e3bc71e0ca917e8b2681ec0a862a506e864641cda18ad94c' 
  AND token = '4/4OR3Tg/B/fyGSfLkyO9SZVIfVpRXvEVDORaVqBRFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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