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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4e3dd4ddbb60235b8523200cd50551fb1005af2c10d40ada8bb106bb8f119b3' 
  AND token = 'yqDm0qiL/Se/JsIm952DZxrAQOpEcnI6THYGaP5I3RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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