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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2f7d86666b0f783d010a7a9a9e8359b4d1faf8af377eb74bd5f296d9c7443f' 
  AND token = 'a+2PZE9Vc2HBGdRsZ6PdIz07sznq3de+7vYMCyMThWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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