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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43321ab0355ade93502feab367737ebcd0fda462e0ee661c5a03f3bb392235d7' 
  AND token = '3skiTMgpb4LRYl5vBKc1Xa29GsJPaw6zO3sUvi78lpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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