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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89506c5444003a777741a7961f6cd96a5fdfca647c7cf7e67a9647932e08dcb5' 
  AND token = 'Ahk3X8WIkQZPA1iefEs5Y/1Ca//n2yyMaIZkt0+tPr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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