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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b620fd3d311da2dcda17b4b56adf9b34527daf616e246dc19203ab64cbc3bf16' 
  AND token = 'h1ncaW1IkGBLay/lHM8uk/6Sri7kUoVCMFrxysF5lW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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