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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b4a74197133a1b30a13a3dd9c4b42fd9c8e0d12dde5ef0f178b7f097411593' 
  AND token = '84R3bG0XQvDjf5BSiYoKNpWF9szlYDKWQC/1aCxWcik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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