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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08fc7c9fe3f6e9d6a3be962c73c91f2733749981e368de587bf7d396460425a1' 
  AND token = '4sjF1sH8RSTSCdrBgjaUAuGlyMoM1GIHHUcp/0hozCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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