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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c8ae44c74bab15552de0ba1807a8b22c676e16f7c1de333816f4621a1d2e09c' 
  AND token = 'bt/TSh7Dfr7dbqCB0oZj3Z6WsfPvart5FANk76FB9P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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