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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88829bd9aabc4f286c1fdff6e4985d1839ac7b7369d1cb456240d2845a2300bd' 
  AND token = 'BJR41sszUdyGWj2IgykOlh6+HsXalxA/i64sGjzI6sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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