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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d75ba94b96b26407c0ef8d3888ff0e53f0113a807ce4b468c4983d88874ce72' 
  AND token = 'OFZXjeLOkBan0e9j8AkFsnbfcLQXuc1XWBO5VlobCFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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