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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '518a0b5318513e50e49458eadb9f50dc82de62a6afbaaef12b4e85deceb5d3db' 
  AND token = 'Hg6jA2t/7gIU11P0u5mS3ns1Z6u4l/1OM7ZfrSUoI3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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