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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7fb9d200399c52242c15136ee97397f5f78fd2a144aba91772da531d06ad6e' 
  AND token = 'jsz85IY2Gk11SqLT+L4bbXG6b43/q76D+TS4TfaCIUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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