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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff10b8d8a53c0a2312ca10c1735609629c3c91d951888f2f1b8eaa74eb5c996' 
  AND token = 'yqiwMZs6xFYKEZEAHtrLb2gWOL10VXLgh/rmNiPZO6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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