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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29bfccad63bb29decc3f5a57f38b3cf55f0a0b23d7e94500136581c5bf20cf99' 
  AND token = 'MXA2glHDpUsdNed5GjlQxYJEa1qTcZBBCR+8VS52CO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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