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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3fcb7760e905cdcb111e9ed8363b61b3470350409634ac6f554bfb38c5d5ec' 
  AND token = 'eglcM9Y81eA57T+EU8jC064gNIGMWQezBIVX46xfbp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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