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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6504f306985196eb603d6b0a37ad8878f8e4608bec90654d952be8ea3b9411b6' 
  AND token = 'UwKVwkrWxSDV8L5h+y8HPbLu4GX1Ne6wCX9TcbweHpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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