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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b7210831834c19d95e678f5fc780d7e52f938aa792fa11fcb08ae7d967472e1' 
  AND token = '6OLvy2ZIRCws37JDVC4kuACWPx27/0n02yI80B/FG+o=' 
  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"
    }
  }
}