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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82103ae8d6ebf9ccf9c160c31bdb79952059064d1444d91d844d6e6393ea3b9e' 
  AND token = '8ehxYLnAPS5QZlYVmAgk3crHhAYnncXw/Jo/B8ao3w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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