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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b8d5f0b66739ee643c4f246dcad9519b120d265fb5010b190b21d66ebe19bf' 
  AND token = 'kkgJkTsMxDww9A0NoFV8P85dMUkehdofX7Ufqt3vFwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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