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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c906d792fd54608ed02f4dcb3debca2104eb84ad843e06a13c1bf393e6baaf6' 
  AND token = '3/hR/xJsKaNA5qQfE8D8YMvkAd3Ho+ae1Scx/6s3tVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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